Abstract:There are two opposite mechanisms for the growth of anodic TiO2 nanotubes. One is the field-assisted dissolution and ejection theory, the other is the oxygen bubble mold. In order to prove the latter mechanism is right, we constructed a three-layer nanotube structure (upper layer nanotubes + dense oxide film + lower layer nanotubes), which was obtained by three steps anodization. The upper and lower layers nanotubes are separated by a dense oxide film. When the dense oxide film is thin, the lower layer nanotub… Show more
“…However, these theories cannot clarify three stages of the current-time curve during anodization. [11][12][13][14][15][16][17] Thompson et al 18 concluded that the above field-assisted dissolution reaction does not contribute to the current variation of anodization. They pointed out that the growth rate of oxide is much higher than the rate of oxide dissolution, and it is impossible to keep a balance between oxide growth and dissolution during anodization.…”
Nowadays the formation mechanism of anodic TiO2 nanotubes has attracted extensive attention. Field-assisted dissolution (TiO2 +6F− +4H+ →[TiF6]2− + 2H2O) has been considered as the causal link to the formation...
“…However, these theories cannot clarify three stages of the current-time curve during anodization. [11][12][13][14][15][16][17] Thompson et al 18 concluded that the above field-assisted dissolution reaction does not contribute to the current variation of anodization. They pointed out that the growth rate of oxide is much higher than the rate of oxide dissolution, and it is impossible to keep a balance between oxide growth and dissolution during anodization.…”
Nowadays the formation mechanism of anodic TiO2 nanotubes has attracted extensive attention. Field-assisted dissolution (TiO2 +6F− +4H+ →[TiF6]2− + 2H2O) has been considered as the causal link to the formation...
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